Thanks doug.

I used this DAT file,and the command termination without any problem.However the mask file dosenot overlay the rIPL area but frontal area when the mask file and fsaverage file were loaded in the freeview.

Here are my scripts for creating the mask.

mri_vol2surf --hemi rh --reg $FREESURFER_HOME/average/mni152.register.dat --mov ./rIPL.nii --o ./rIPL_mask.mgh --trgsubject fsaverage

Source file volume-based mask ROI "rIPL.nii" is in the MNI152 space, and two snapshot can be got in the attachment. Also registrated surface ROI mask rIPL_mask.mgh snapshot can be got in the attachment.

Here is its output in the command window.

=========================================================================================

srcvol = ./rIPL.nii
srcreg = /mnt/sdb1/psylab16/BACKUP/freesurfer/freesurfer/average/mni152.register.dat
srcregold = 0
srcwarp unspecified
surf = white
hemi = rh
trgsubject = fsaverage
surfreg = sphere.reg
reshape = 0
interp = nearest
float2int = round
GetProjMax = 0
INFO: float2int code = 0
INFO: changing type to float
Done loading volume
WARNING: the voxel resolution in the source volume (2,2,2) differs
         from that listed in the registration file (1,1,1)
Reading surface /mnt/sdb1/psylab16/BACKUP/freesurfer/freesurfer/subjects/fsaverage/surf/rh.white
Done reading source surface
Mapping Source Volume onto Source Subject Surface
 1 0 0 0
using old
Done mapping volume to surface
Number of source voxels hit = 21146
Writing to ./rIPL_mask.mgh
Dim: 163842 1 1
=================================================================================================

Thanks

All the best

Rujing Zha